"I wish to remain human", you say. However, being the pervert that you are, you happen to be thinking of Japanese schoolgirls at that moment, unaware that the genie is telepathic. "Ah, so that is what you wish to be", the genie says. You give him a puzzled look wondering what he means, but he has already started his spell.
His zap hits you and you are surrounded by a bright light, and the changes start instantly: your feel your crotch suck back into your body, making your pants fit really odd while your chest starts bulging up into a B cup, a teenage chest at best. Your entire figure warps around as you become shorter, your skin starts accumulating fat where there was none before - especially in your buttocks and face - and surprisingly, your eyes become a bit more slanted and the irises turn a solid brown. Your hair quickly goes from blond to black and stretches out over your shoulders.
Your skin was a pale white before, but now you suddenly see it's getting a golden yellow hue all over, with the genie standing there grinning widely. You now look like a severely tanned female with non-fitting clothes, but the latter is quickly fixed as your clothing begins to warp on your body...into a schoolgirl sailor outfit. You now finally realize what the genie meant and want to throw angry expletives at him, but all that comes out of your mouth is high-pitched Japanese even though you never remember learning this language.
As you stand there pouting angrily as a Japanese schoolgirl, the genie asks:"What will your next wish be, my mistress?"